Self-opening adjustable die-head.



W. H. GATES.

SELF OPENING ADJUSTABLE DIE HEAD.

APPLICATION FILED NOV. 20. 1914.

1 1 48,5 1 U. Patented Aug. 3, 1915.

2 $HEETS-SHEET 1.

INVENTOR.

W. H. GATES.

SELF OPENING ADJUSTABLE DIE HEAD.

APPLICATION FILED NOV. 20, l9l4.

Patented Aug. 3, 1915.

2 SHEETS-SHEET 2.

INVENTOR;

WW W WITN ESSES.

WILLIAM H. GATES, OF NEW HAVEN, CONNECTICUT,

SELF-OPENING ADJUSTABLE DIE-HEAD.

Application filed November 20, 1914.

To all whom it may concern:

Be it known that I, WILLIAM H. GA'rns, a citizen of the United States, residing at New Haven, in the county of New Haven 'and State of Connecticut, have invented cer tain new and'useful Improvements in Self- Opening Adjustable Die-Heads; and I do hereby declare the following to be a full, clear, and exact description of the inven tion, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in self opening adjustable die heads, and it consists in certain details of construction to be more fully set forth in the following specification and claims.

Referring to the drawings: Figure 1 rep resents a front elevation of the die head showing the threading dies opened; Fig. 2 is a side elevation of the die head; Fig. 3 is a front elevation of the die head showing the threading dies closed; Fig. 4 is a broken side elevation of the die head partly in section showing the threading dies closed; Fig. 5 is a front elevation of the die head with the front plate removed showing the threading dies open Fig. 6 is a side elevation, of the die head partly in section showing the threading dies opened; Fig. 7 is a central sectional view of the die head on line 7-7 of F ig. 1; Fig. 8 is a rear elevation of the diehead partly insection showing the trip lever for releasing the sliding shell that carries the mechanism for actuating the threading dies; Fig. 9 is abroken side elevation partly in section; Fig. 10 is a broken rear elevation partly in section show ng the position occupied by the trip lever when the sliding shell is released; Fig. 11 is a detail side elevation of one of the threading dles; Fig. 12 is a detail end elevation of one of the threading dies; Fig. 13 is a detail view of oneof the cam studs for actuating the dies; Fig. 14 is an enlarged detail upper plan view of the dialfor indicating the cut of the dies and its retaining plate; Fig. 15 is an enlarged detail central sectional view of the rotatable cam disk carried by the sliding shell and adapted to support the nodicator dial; Fig. 16 is an enlarged detall reverse view of the rotatable cam disk and a detail upper plan view of the slidingshell locking member; Fig. 17 is an enlarged detail view of a cam pin carried by the trip lever for actuating the sliding shell locking Specification of Letters Patent.

Patented Aug. 3, 1915. Serial No. 873,098.

member; Fig. 18 is an enlarged upper plan view of the sliding shell locking member, and Fig. 19 is an enlarged broken detail side elevation partlyin section shell locking member.

The head 1 is provided with the radial slots 2 to receive the dies 3, and the shank 4 adapted to be secured in a turret head or other like carrier.

5 is a die actuating shell mounted to slide on the enlarged portion of the die head proper and its shank. The four cam studs 6 are anchored to the shell 5 by the pins 7 and have a longitudinal movement with the shell, and they are supported in the holes 8 formed in the die head.

Each of. the threading dies 3, Figs. 4, 5, 6, 11 and 12 is provided with the cam groove 10 adapted to receive the cam projection 11 of the studs 6 whereby the dies are radially actuated by the reciprocation of the shell 5.

The mechanism for automatically locking the shell 5 inits several advanced positions and releasing the same, comprises the locking member 12 adapted to enter the recess 13, Fig. 7 of the head'l and is outwardly actuated by the spring 14.

15, Figs. 7 and 9 is a disk rotatably inserted in the shell 5,' and is maintained therein by the'indicator dial 16, see also Fig. 2. The under side of said disk, see particularly Figs. 15 and 16, is provided with the cam recess 17 adapted to receive the upper end 18 of the locking member 12 for the purpose presently to be more fully described.

The cam pin 19, Figs. 7 and 17, is journaled in the rear wall of the shell or sleeve 5 and is embraced and secured to the trip lever 20 by the pin 21. This lever is located and adapted to operate in the recess 22 located in the rear wall of the shell 5. The reduced portion 23 of the cam pin is adapted to enter the recess 24 of the locking member when said bolt or locking member is engaged with the cam recess 17 of the disk 15 and when thus entered the lower flat side of such reduced portion will lie against the bottom of the recess'in the locking member' as shown in Fig. 7 so that when the trip lever is actuated the turning of the cam pin will temporarily depress said locking member and the flat spring 25 will return it to its normal position.

The indicator dial 16, as before mentioned, is secured to the upper reduced portion of of the sliding the disk 15 by the screw 26, Figs. 1 and2, and the disk is held against rotation by means of end pressure applied to the plate 27, which plate is secured to the sliding shell by the screw 28.

The forward position of the sliding shell is limited and regulated by the position of the upper end 18 of the locking member with respect to the sidewalls of the cam recess 17-,- Fig. 16' and the position of the cam recess is regulated by the indicator dial 16.

The zero mark on the dial will indicate the standard cut with the upper end 18 of the locking member the highest point a of the cam recess, and any other position that said end" occupies with respect to the cam w1ll cause the dies to out below standard sizes. In: other words, when the disk 15 is set in the position shown in Fig. 16, it is evident that the highest point a. of the cam w1ll sooner permit the locking member to enter the cam recess and securely lock the shell than at any other point in said recess. The

' engagement of the locking member with any other point of the cam willrequire the sliding shell to travelfarther before said member'canenter' the cam recess, and he fartherthe shell has to travel forward before it is locked and in position for the dies to cut, the closer the dies will be to the center of the head and the smaller the dies will cut. The indicator ring 16 can be so finely graduated that any predetermined amount of re.- duction can beinstantly obtained by simply turning the disk 15 to bring any partlcular graduation opposite the zero mark 29, Fig. 2, that will represent the amount of reduction required. This arrangement for varying the cut -of'the dies is a very important feature both to compensate for the wear of the dies, and' the frequent necessity of cutting threads below standard sizes.

It will be noted that the actuating feature of the dies, viz'.: the cams 11 of the studs 6 are directly over the work where the greatest resistance, is required, thus counteracting any tendency of the dies to be forced back and away from the work during thecutting operation. The cam grooves of the dies, being on the same side as the cutting edge, will, should any appreciable wear occur either on the cams 11 of the studs or the cam grooves 10 of the dies, always insure a proper clearance, as the cutting strain will. force the dies in the opposite direction and thus tend to raise the heel of the dieand' lower the cutting edge. The cam actuating means thus located directly over the cut will alwaysinsure aparallel movement of the dies.

When the vdie head is advanced toward the worknot shownthe sliding shell will be lockedin its forward position as shown in Fig. 7 and when the dies have performed the work required, a projection on the machinenot shownwill engage the trip lever 20 and force it back into the position shown in Fig. 10, which will depress the sliding shell locking member in the man- 'ner previously described, and, as soon as matically relocked, by any well known means,not shown,in readiness for a repetition of the cutting operation.

The stop pin 31, Fig. 7 and the slot 32 in the shank limits the forward and backward travel of the sliding shell and also maintains working connection between the die head and shell. The spring 33 and threaded nut 34 will keep the stop pin in proper relation with slot 32.

The screw 35 carried by the die head is ada ted to engage the groove 36 of the looking member 12 to maintain said member in place. The front of the head is provided with the usual plate 37 secured to the head by the screws 38.

While the cam grooves are shown as being located on the cutting face of the dies, they could be formed on their opposite faces, but it is evident that their present position will give a much better clearance to the cutting teeth.

Other minor changes could be effected without departing from the spirit of my invention asset forth in the claims.

Having thus described my invention, what I claim is 1. In combination with a die head carrying radially operating threading dies and a longitudinally operating shell embracing the head, of cam studs secured to the shell and passing through said head and supported thereby, said dies having cam grooves formed in their cutting faces and over their cutting edges adapted to register with the cam portion of the studs to actuate the radial movement of the dies to open and close, looking mechanism carried by the head and engaging the shell to hold the shell in an advanced position, and means for releasing the locking mechanism.

2. In combination with a die head carrying radially operating threading dies and a longitudinally sliding shell embracing the head, the dies having cam grooves formed in their cutting faces and over the cutting edges thereof, cam members carried by the shell and passing through and supported by said head to register with said cam grooves to actuate the radial movement of the dies to open and close, an automatically operated locking member adapted to secure the shell to the head in its forward position when the dies are closed, and automatic means for releasing the shell locking member and retracting the shell.

3. In combination with a die head carrying radially operating threading dies and a longitudinally sliding shell embracing the head, said dies having cam grooves formed in their cutting faces and over the cutting edges thereof, cam members carried by the shell and passing through and supported by said head to register with said cam grooves to actuate the radial movement of the dies to open and close, an automatically operated locking member for securing the shell to the head, an automatically operated member adapted to actuate the locking member to release the shell, and automatically operating means for retracting said shell.

4. In a die head of the character described carrying radially operating threading dies having cam grooves in their cutting faces and located over their cutting edges, a sliding shell embracing the head, cam members carried by the shell adapted to register with said cam grooves to actuate the radial movement of the dies to open and close, a disk rotatably located in the shell having a cam on its underside, and a dial connected with its upper surface, a shell locking member adapted to automatically engage the cam portion of the disk to temporarily lock the shell in any of its advanced positions, a cam pin to actuate the locking member and release the shell, and a trip lever for actuating the cam pin.

5. In a die head of the character described carrying radially operating threading dies and a sliding shell embracing the head, actuating means carried by the shell for operating the dies to open and close, a rotatable disk mounted in the shell and having a cam on its underside, and a dial connected with its upper surface, and an automatically operated locking member adapted to contact with said cam to lock the shell in its several advanced positions.

,6. A die head carrying radially operating dies, a shell longitudinally movable on the head, means carried by the shell for advancing and retracting the dies, automatically acting locking means carried by the head, a disk carried by the shell and provided with a portion that is engaged by the locking means to hold the shell in an advanced position, mechanism for releasing the looking means, and means for retracting the shell when released.

7. In combination with a die head carrying radially operating threading dies and a longitudinally operating shell embracing the head, of cam studs secured to the shell and passing through said head and supported thereby, said dies having cam grooves formed in their cutting edges adapted to register with the cam portion of the studs to actuate the radial movement of the dies to open and close.

In testimony whereof I affiX my signature in presence of two witnesses.

WILLIAM H. GATES.

Witnesses:

BENJ. P. GREENE,

E. T. OAsE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

